Analysis On Shear Wall Structure-Fondation-Subgrade Interaction

The main task of structural design is for high-rise and ultrahigh-rise buildings to resist the horizontal effect. Its key problem is to select structure design of good lateral stiffness. The concrete shear wall structure uses cast-in-site concrete building walls as buildings’load-bearing system. It’s widely used in high-rise and ultrahigh-rise buildings because of its strong lateral stiffness, good entirety and resistance of the horizontal effect.Conventional structure design method out of simplifying the analysis isolates the interaction between upside structure and foundation, resulting in unsafety of upside structure design and uneconomicalness of the foundation design. Because the superstructure, ground base and foundation are a co-ordination with each other, working together as a whole; the work effect of each part is the result of combined action, the theory of interaction should be adopted to design high-rise buildings. Only in this way can the actual structure working state be truly reflected and only then can it be the safest, most economical and reasonable. Therefore, considering the calculation method of interaction between the upper and lower structures attracts more and more attention of the Engineering. However, analysis of interaction is used as a structural design method. Its theoretical research and engineering practice is still in the stage of development and perfection. There is still a lot of basic work to be continued.This paper systematically elaborates on the interaction between the superstructure, ground base and foundation and mainly finished the following work:(1) Using conventional shear wall design method—the basic theory of coupling beams, it derived the basic calculation equations of interaction between the upper and lower structures of double shear wall and multi-shear wall under horizontal load.(2) Based on the calculation equations of interaction proposed in this paper, it analyzed the internal forces and horizontal displacement of the upper structure under horizontal load and compared it with conventional design method.(3) Based on the calculation equations of interaction proposed in this paper, it analyzed, when the level of stiffness of the superstructure changes, the internal forces and deformation characteristics of the superstructure, ground base and foundation under horizontal load. (4) Based on the calculation equations of interaction proposed in this paper, it analyzed, when the level of stiffness of the ground base changes, the internal forces and deformation characteristics of the superstructure, ground base and foundation under horizontal load.(5) Based on the calculation equations of interaction proposed in this paper, it analyzed, when the level of stiffness of foundation changes, the stress and deformation characteristics of the superstructure, ground base and foundation under horizontal load.(6) All of the above analytic targets and results were discussed and the factors and law that affect the interaction were summarized too. The paper also examined the rationality and superiority of the proposed method and discussed its application and guidance in engineering practice.